JPS62286563A - Cyclone type electrostatic precipitator - Google Patents

Abstract

PURPOSE:To enhance the removal efficiency of fine particles by effectively separating and recovering said fine particles, by applying high voltage to a cyclone main body and the discharge electrode arranged therein. CONSTITUTION:The medium such as oil mist made to flow in a cyclone main body 2 from the suction port 7 of a fan 5 revolves in the cyclone main body 2 by an air stream and is discharged from a discharge pipe 3 while sent to the lower part of said main body 2. The fine particles contained in the medium contact wit the electrode parts 12A of needle end discharge electrodes 12 when passes through the cyclone main body 2 and passes through the electrode field due to strong corona discharge generated by applying positive and negative high voltage DC electricities between the discharge electrodes 12 and the wall part of the cyclone main body 2. At this time, fine particles are flocculated electrostatically and grown into coarse particles while electrostatic flocculation is allowed to successively advance by centrifugal motion due to the revolution of the air stream. Coarse particle groups are electrically attracted to the wall part of the cyclone main body 2 and sent to the side of a dust collection chamber 8 to be recovered.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] The present invention is a cyclone-type electric motor suitable for collecting and removing fine particles contained in media such as welding fumes and oil mist. This relates to a dust collector.

[Prior Art] What is a device for collecting and removing fine particles and powder (fine particles, etc.) in media such as welding fumes and oil mist? The medium is introduced between an appropriate mesh net member subjected to tF electricity and an electrode disposed opposite to the medium, and the fine particles, etc. are electrostatically condensed and coarsened, and the particles are adsorbed to the net member and removed. Those that did were generally adopted.

[Problems to be Solved by the Invention] In the prior art, fine particles etc. are adsorbed to the net member as described above, but if the fine particles etc. are sticky, it is difficult to remove them from the net member, and cleaning is difficult. Problems that are inferior to gender arise. Further, there is a drawback that fine particles and the like pass through the gaps in the net member, resulting in a reduction in the removal rate.

The present invention solves the above-mentioned problems and drawbacks, and aims to provide a cyclone electrostatic precipitator that can effectively separate fine particles, increase the amount of collected particles, and improve the removal rate.

[Means for solving problems] The present invention is a welding fume introduced for this purpose.

A cyclone that swirls and discharges a medium such as oil mist and has a wall portion that is electrified with high voltage, and a discharge electrode that is placed in contact with the medium within the cyclone and is energized with high voltage. This constitutes a type electrostatic precipitator.

[Function] The inflowing medium is passed through the cyclone while being swirled, and the contained fine particles are electrostatically condensed, and the particles are gradually coarsened by the discharge electrode and adsorbed to the wall of the cyclone, and are then appropriately removed. Concentrate it in one location and remove it.

[Example] An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, the cyclone 1 is formed from a cylindrical cyclone body 2, an exhaust pipe 3, a guide plate 4, etc., which are eccentrically arranged on the cyclone body 2. The connecting pipe 6 connected to the fan 5 is connected in the tangential direction of the outer circumference of the cyclone main body 2 (second
(as shown in the figure). With the above structure, media such as welding fume and oil mist sucked from the suction lower of the 7-an 5 flow into the cyclone body 2 through the connecting pipe 6 and are sent to the lower side in the figure while swirling the airflow. Note that although the guide plate 4 has the effect of improving the passage efficiency of the medium, it is not necessarily necessary to provide it. A dust collection chamber 8 is provided on the lower side of the cyclone body 2, and inside the dust collection chamber 8 there is an inspection outlet 9 for inspecting the state of collected fine particles, etc. and for discharging them. A cover 10 is provided. A drain 11 is provided in the opening bar 1O.

A needle end discharge electrode 12 is provided on the upper side of the cyclone body 2 in the figure. The electrode portion 12A of the needle end discharge electrode 12 is disposed in a bulged manner within the cyclone body 2, and comes into contact with the medium flowing into the cyclone body 2.

Further, as shown in FIG. 2, a plurality of needle end discharge electrodes 12 (three in the figure) are provided, and are insulated and fixed from the cyclone body 2 by an insulator 13.

Electric wire 15 connected to high voltage power supply section 14. te is connected to the wall of the cyclone body 2 and the needle end discharge electrode 12, respectively, and applies positive or negative high voltage DC electricity (10,000 ports or more) to each other.

As shown in FIG. 3, an inclined plate 17 that slopes downward toward the cover IO side is provided in the dust collection chamber 8 to send the fine particles and the like in the dust collection chamber 8 to the cover IO side. This improves the ability to discharge fine particles and the like. The shape of the dust collection chamber is as shown in Figure 4.
A dust collection chamber 8A having a tapered lower side and an on-off valve 18 installed therein may be used.

Next, the operation of this embodiment will be explained in more detail.

The medium sucked from the suction lower of the fan 5 is transferred to the connecting pipe 6
Flows into the cyclone body 2 from the cyclone body 2.
The airflow is not sent downward by swirling inside the air, but is exhausted from the exhaust air v3. When the fine particles contained in the medium pass through the cyclone body, they come into contact with the electrode portion 12A of the needle end discharge electrode 12, and the positive and negative high pressures between the needle end discharge electrode 12 and the wall portion of the cyclone body 2 are generated. It passes through an electric field due to a strong corona discharge generated by DC electric current application, and is electrostatically condensed at this time, and becomes coarser as the electrostatic condensation is gradually increased due to the centrifugal movement caused by the swirling of the airflow. The coarse particles are electrically attracted to the wall of the cyclone body 2. The coarse particles adsorbed on the wall are collected in the dust collection chamber 8 (8A).
It is sent to the side, deposited and collected. The medium from which fine particles and the like have been removed is discharged from the exhaust pipe 3 as described above. Furthermore, the third
The fine particles and the like deposited on the inclined plate 17 shown in the figure are sent to the cover 10 side at the lower inclined end and are easily discharged and removed.

As an experimental example of this embodiment employing three needle end discharge electrodes 12 as shown in the tjSZ diagram, when fine particles, etc. are flowed into the cyclone body 2 with an air volume of 20 m3/win and an outer cylinder diameter of 400 m1n, the following data are obtained. was gotten. That is, when high voltage was applied to the cyclone body 2 and the needle end discharge electrode 12, 400 g of the 410 g of powder of 20 colors of uniform particle size put in was recovered. In other words, the recovery efficiency was increased to 97.58%. Also, if no electricity is applied, 400g
There was a recovery amount of 355g for the 355g deposited.

The recovery efficiency was 88.75%. In addition, in an experiment in which cooking oil was boiled and gauze was hung from the exhaust port of the exhaust pipe 3 to examine the change in color caused by the oil, it was found that the energized version reached the same chromaticity compared to the electrified version. It turns out that it takes 4.9 times more time.

Furthermore, it has become clear that in this case, oil smoke that is visible when no electricity is applied is not visible when electricity is applied.

As described above, it was found that applying high voltage as in this example greatly increases the particle collection efficiency.

In this embodiment, as shown by the two-dot chain line in FIG. 1, a noise reduction box 19 that covers the exhaust port of the exhaust pipe 3, a filter-like exhaust port 20 provided therein, casters 21 for smoothly moving the entire device, etc. are installed. It may be made to be attached.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to effectively separate fine particles, increase the amount of collected particles, and improve the removal rate.

[Brief explanation of the drawing]

Fig. 1 is an overall structural diagram of the present invention, Fig. 2 is a top view showing the needle end discharge electrode and cyclone main body structure in Fig. 1, and Figs. 3 and 4 show the structure inside the dust collection chamber of the embodiment. It is a partially sectional view. l...Cyclone? ...Cyclone body, 3...
・Exhaust pipe, 4... Information board, 5... Fan. 6... Connecting pipe, 7... Suction port, 8.8A... Dust collection chamber, 9... Inspection outlet, 10... Cover, 11...
Drain drain, 12...needle end discharge electrode, 12A...electrode part, 13...insulator, 14...high voltage? ! Genbu, 1
5.18... Electric wire, 17... Inclined plate, 1B... Open/close valve, 19... Silence box, 20... Filter-like exhaust port, 2I... Caster.

Claims (1)

[Claims] A dust collector for collecting and removing particulates in a medium such as welding fume and oil mist, which includes a cyclone that discharges the inflowing medium by swirling the medium and has a wall section that is electrified with high voltage; A cyclone type electrostatic precipitator, characterized in that a discharge electrode is provided in a position in contact with the medium and is applied with a high voltage.